01-03-2012, 06:18 PM
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Just came across this thread, and would like to offer a comment on the idea of angelfish and gourami together. As indicated in our profile, and mentioned by Gwen, this is not a recommended match.
There are a number of guidelines when it comes to keeping fish species together. Most of these are certainly not cut in stone as hard and fast rules. But they are based on scientific fact, and should not be ignored. Fish are sometimes quite individual; not all cichlids, anabantids, characins, etc behave the same even within a given species, but the behaviour of the majority of a species tells us what is programmed into the fish by nature, and this trait is more than likely to occur at some point if the fish is healthy and in a proper environment. Ironically, less than suitable conditions often bring these traits out even worse.
Angelfish and gourami are both territorial, and aggressive to some degree. No mention is made of which gourami species; some easily attain 5-6 inches, comparable to an angelfish. These fish are very likely to view one another as rivals, and a 75g tank (presumably 4 feet in length) is no where near sufficient space for several rival 6-inch fish to cohabit without someone losing. And that means stress which weakens the immune system and leads to various health problems that would otherwise not likely occur. And a shorter lifespan is almost inevitable.
A group of 4 angelfish will almost fill a 4-foot tank; a couple more could be added, I would suggest 5-6, and this might actually be better. The more in the group, the less likely there will be significant damage to a weaker fish, though this too is not always a certainty. When I say "fill" i do not mean no other fish; but a group of angelfish will own a 4-foot tank which is to the fish a very small and confined space. Substrate fish and peaceful upper and mid-water fish can be included, being careful with species to avoid fin-nippers or small fish that will easily be eaten.